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Maximum
allowable
length
From outdoor unit (*4)
to indoor unit
Actual piping length
Actual piping length from the outdoor unit (*4) to the indoor unit: ≤540 ft. (165 m)
(Example) 4
: a+e+h+j≤540 ft. (165 m),
7
: a+b+c+d+m+n+p≤540 ft. (165 m),
11
: a+b+r+u+w≤540 ft. (165 m),
12
: a+b+c+d+q≤540 ft. (165 m)
Equivalent length
Equivalent piping length from the outdoor unit (*4) to the indoor unit: ≤623 ft.
(190 m) (*6)
(Calculate the equivalent piping length for the REFNET joint as 1.6 ft. (0.5 m),
REFNET header as 3.3 ft. (1 m), BS4
•
6Q54T
*
as 19 ft. (6 m), BS8 to 12Q54T
*
as
33 ft. (10 m), BSQ36
•
60T
*
as 13 ft. (4 m), and BSQ96T
*
as 19 ft. (6 m).)
For the equivalent length of BSF-Q54T
*
, refer to the table below based on the total
capacity of the indoor units to be connected downstream.
Also add 14 ft. (4.3 m) to the below length when calculating an equivalent length to
each indoor unit connected to BSF-Q54T
*
.
Total capacity of the indoor
units to be connected down
-
stream
Equivalent length
BSF4Q54T
*
BSF6Q54T
*
BSF8Q54T
*
< 54
1 ft. (0.4 m)
1 ft. (0.4 m)
1 ft. (0.4 m)
54 ≤ × < 72
1 ft. (0.4 m)
1 ft. (0.4 m)
1 ft. (0.4 m)
72 ≤ × < 111
2 ft. (0.7 m)
2 ft. (0.7 m)
2 ft. (0.7 m)
111 ≤ × < 162
5 ft. (1.6 m)
7 ft. (2.2 m)
7 ft. (2.2 m)
162 ≤ × < 230
7 ft. (2.2 m)
11 ft. (3.4 m)
11 ft. (3.4 m)
230 ≤ × ≤ 290
14 ft. (4.3 m)
19 ft. (5.8 m)
19 ft. (5.8 m)
Total extension
Total actual piping length from the outdoor unit (*4) to all indoor units: ≤3280 ft.
(1000 m)
From first outdoor unit
multi connection pip
-
ing kit to outdoor unit
(in a multi system)
Actual piping length
Equivalent length
Actual piping length from the first outdoor unit multi connection piping kit to the
outdoor unit: ≤33 ft. (10 m)
Equivalent piping length from the first outdoor unit multi connection piping kit to the
outdoor unit: ≤43 ft. (13 m)
Outdoor unit
A
D
C
B
A≤33 ft. (10 m) (equivalent length≤43 ft. (13 m))
B+C≤33 ft. (10 m) (equivalent length≤43 ft. (13 m))
B+D≤33 ft. (10 m) (equivalent length≤43 ft. (13 m))
Allowable
height differ
-
ence
From outdoor unit to
indoor unit
Height difference
Height difference between outdoor unit and indoor unit (H1): ≤164 ft. (50 m) (if
outdoor unit is lower than indoor unit, ≤130 ft. (40 m)) (*7)
From indoor unit to
indoor unit
Height difference
From outdoor unit to
outdoor unit
Height difference
Height difference between outdoor units (H3): ≤16 ft. (5 m)
Allowable
length after
branch (*5)
From branch to indoor
unit via 1 Branch
Selector unit
Actual piping length
Actual piping length from the first REFNET joint or REFNET header to indoor
unit: ≤130 ft. (40 m) (*9)
(Example) 4
: e+h+j≤130 ft. (40 m),
7
: b+c+d+m+n+p≤130 ft. (40 m)
From branch to indoor
unit via Branch Selec-
tor units connected in
pass through
Actual piping length from the first REFNET joint or REFNET header to indoor
unit: ≤130 ft. (40 m) (*8) (*9)
(Example) 11
: b+r+u+w≤130 ft. (40 m)
(*4) In the case of an outdoor units multi system, “outdoor unit” should be read as the “first outdoor unit multi connection piping kit”, seen from the
indoor units side.
(*5) A multi Branch Selector unit is to be considered as a branch (a single Branch Selector unit is not), so in the case where only 1 multi Branch Se-
lector unit is included in the system, the actual piping length from each branch port of the multi Branch Selector unit to each indoor units should
be ≤130 ft. (40 m).
(*6) In the case where the equivalent piping length from outdoor units to indoor units ≥295 ft. (90 m), make sure to upsize the liquid pipe of the main
pipe (see the figure below), referring to the table below. (Do not upsize the high/low pressure gas pipe and the suction gas pipe.)
Actual piping length X Height difference between indoor units (H2)
X≤540 ft. (165 m)
≤49 ft. (15 m)
X≤390 ft. (120 m)
≤98 ft. (30 m)
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